memcached 集群搭建 magent+keepalived

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本文详细介绍如何在Linux环境下安装配置Memcached缓存系统，包括M和S节点的设置，以及通过Keepalived实现高可用的magent代理层搭建过程。涉及关键步骤如环境准备、软件编译安装、服务启动与脚本编写。

memcached安装

M 192.168.10.252
S  192.168.10.253

cd /tmp
#安装环境
yum install gcc gcc-c++ make -y

#下载 libevent-2.1.8-stable.tar.gz
http://libevent.org/

#解压
tar xf libevent-2.1.8-stable.tar.gz -C /opt
cd /opt/libevent-2.1.8-stable/
./configure --prefix=/usr/local/libevent
make && make install

#下载memcached安装包
cd /tmp
wget https://memcached.org/files/memcached-1.5.20.tar.gz
tar xf memcached-1.5.20.tar.gz -C /opt/
cd /opt/memcached-1.5.20/
./configure \
--prefix=/usr/local/memcached \
--with-libevent=/usr/local/libevent/
make && make install

#memcached 复制功能需要模块
ln -s /usr/local/libevent/lib/libevent-2.1.so.6.0.2  /usr/lib64/libevent-2.1.so.6

#启动 M节点
cd /usr/local/memcached/bin/
./memcached -d -m 32m -l 192.168.10.252 -p 11211 -u root

#启动 S节点
cd /usr/local/memcached/bin/
./memcached -d -m 32m -l 192.168.10.253 -p 11211 -u root

#检查进程和端口
ps -ef | grep memcached
lsof -i:11211

magent 安装

cd /tmp
mkdir /usr/local/magent -p
tar xf magent-0.5.tar.gz -C /usr/local/magent
cd /usr/local/magent
#让动态链接库为系统所共享
/sbin/ldconfig

#编辑ketama
vi ketama.h
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767

[root@k8s-node02 magent]# cat ketama.h 
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767

#配置libevent
vi Makefile
LIBS = -levent -lm  -L /usr/local/libevent/lib
INCLUDE=-I /usr/local/libevent/include

[root@k8s-node02 magent]# cat Makefile
LIBS = -levent -lm  -L /usr/local/libevent/lib
INCLUDE=-I /usr/local/libevent/include
CFLAGS = -Wall -O2 -g
CC = gcc
#编译
[root@k8s-node02 magent]# make 
gcc -Wall -O2 -g -I /usr/local/libevent/include -c -o magent.o magent.c
gcc -Wall -O2 -g -I /usr/local/libevent/include -c -o ketama.o ketama.c
gcc -Wall -O2 -g -o magent magent.o ketama.o -levent -lm  -L /usr/local/libevent/lib

#复制编译完的可执行文件到系统管理
cp /usr/local/magent/magent /usr/bin/
#复制到从服务器
scp /usr/local/magent/magent root@192.168.10.253:/usr/bin

keepalived M安装

#keepalived 安装
yum -y install keepalived

cat >> /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived

global_defs {
      router_id magent_meM         #router_id  magent_meM
}

vrrp_script magent {                 
    script "/opt/scripts/magent.sh"
    interval 2
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160             #本地网卡名称
    virtual_router_id 51       #id主从一致
    priority 100                    #主优先级大于从优先级
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    
#调用函数
track_script {                  
        magent
    }
    
#vip地址
virtual_ipaddress {         
        192.168.10.222
    }
}
EOF

#magent.sh 脚本
cat >>  /opt/scripts/magent.sh << EOF
#!/bin/bash

Keepalived=`ps -ef | grep keepalived | grep -v grep | wc -l`
if [ $Keepalived -gt 0 ]; then	
        magent -u root -n 51200 -l 192.168.10.222 -p 12000 -s 192.168.10.252:11211 -b 192.168.10.253:11211
else
        pkill -9 magent
fi
EOF

参数说明：
      -n 51200                #定义用户最大连接数
      -l 192.168.10.222  #指定虚拟IP
      -p 12000                #指定端口号
      -s                          #指定主缓存服务器
      -b                          #指定从缓存服务器

#授权和启动
chmod +x /opt/scripts/magent.sh
systemctl enable keepalived
systemctl start keepalived

#查看代理端口
netstat -anpt | grep 12000
#keepalived 状态
systemctl status keepalived
#查看vip
ip addr show ens160
#memcached 端口
netstat -anpt | grep 11211

keepalived S安装

#keepalived S安装
yum -y install keepalived

#keepalived.conf 文件和master相比修改了三处
#state BACKUP
#router_id magent_meS
#priority 90  

cat >> /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived

global_defs {
      router_id magent_meS         #router_id  magent_meS 
}

vrrp_script magent {                 
    script "/opt/scripts/magent.sh"
    interval 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens160             #本地网卡名称
    virtual_router_id 51       #id主从一致
    priority 90                    #主优先级大于从优先级
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    
#调用函数
track_script {                  
        magent
    }
    
#vip地址
virtual_ipaddress {         
        192.168.10.222
    }
}
EOF

#magent.sh 脚本
mkdir  /opt/scripts
cat >>  /opt/scripts/magent.sh << EOF
#!/bin/bash

Keepalived=`ps -ef | grep keepalived | grep -v grep | wc -l`
if [ $Keepalived -gt 0 ]; then	
        magent -u root -n 51200 -l 192.168.10.222 -p 12000 -s 192.168.10.252:11211 -b 192.168.10.253:11211
else
        pkill -9 magent
fi
EOF

#授权启动
chmod +x /opt/scripts/magent.sh
systemctl enable keepalived
systemctl start keepalived

#keepalived 状态
systemctl status keepalived
#查看vip
ip addr show ens160
#memcached 端口
netstat -anpt | grep 11211

测试

#安装telnet
yum install telnet -y

#连接VIP
[root@k8s-node01 ~]# telnet 192.168.10.222 12000
Trying 192.168.10.222...
Connected to 192.168.10.222.
Escape character is '^]'.
set u1 0 0 5
12345
STORED
get u1
VALUE u1 0 5
12345
END
quit
#连接M节点
Connection closed by foreign host.
[root@k8s-node01 ~]# telnet 192.168.10.252 12000
Trying 192.168.10.252...
telnet: connect to address 192.168.10.252: Connection refused
[root@k8s-node01 ~]# telnet 192.168.10.252 11211
Trying 192.168.10.252...
Connected to 192.168.10.252.
Escape character is '^]'.
get u1
VALUE u1 0 5
12345
END
quit
Connection closed by foreign host.
#连接S节点
[root@k8s-node01 ~]# telnet 192.168.10.253 11211
Trying 192.168.10.253...
Connected to 192.168.10.253.
Escape character is '^]'.
get u1
VALUE u1 0 5
12345
END